.car-img{
    width:100%;
}
nav{
    margin-top:20px;
}
#sd{
    top:0px;
    position: absolute;
    Z-index: -9;
    width:100%;
}
.to-top{
    Z-index:10;
}
.carousel-inner .item{
    height:400px;
    background-repeat: no-repeat;
}
.item-1{
    background-image: url("http://v2.bootcss.com/assets/img/examples/slide-01.jpg ");
}
.item-2{
    background-image: url("http://v2.bootcss.com/assets/img/examples/slide-02.jpg ");
}
.item-3{
    background-image: url("http://v2.bootcss.com/assets/img/examples/slide-03.jpg ");
}
.car-cont{
    margin-top:200px;
}